Would you need to pull it apart later? I’m seeing the concatenated string as essentially a hash itself, only part of which is based on the original value. So, for example, when preventing re-import of a blocked address, the “new” address would be hashed, the string concatenated, and then the resulting value verified to not be blacklisted.
I might be missing something… I haven’t had any coffee yet today. And I think I’m coming up with cohesive sentences, so that’s something!